Lt. Gen. H. R. McMaster is expected to resign and will be replaced by John R. Bolton.

President Trump tweeted, “I am pleased to announce that, effective 4/9/18, @AmbJohnBolton will be my new National Security Advisor. I am very thankful for the service of General H.R. McMaster who has done an outstanding job & will always remain my friend. There will be an official contact handover on 4/9.

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I am pleased to announce that, effective 4/9/18, @AmbJohnBolton will be my new National Security Advisor. I am very thankful for the service of General H.R. McMaster who has done an outstanding job & will always remain my friend. There will be an official contact handover on 4/9.

McMaster issued a statement through the White House after the announcement.

"After thirty-four years of service to our nation, I am requesting retirement from the U.S. Army effective this summer after which I will leave public service. Throughout my career it has been my greatest privilege to serve alongside extraordinary servicemembers and dedicated civilians.

I am thankful to President Donald J. Trump for the opportunity to serve him and our nation as national security advisor. I am grateful for the friendship and support of the members of the National Security Council who worked together to provide the President with the best options to protect and advance our national interests.

I am especially proud to have served alongside the men and women of the National Security Council Staff who established a strong foundation for protecting the American people, promoting American prosperity, achieving peace through strength, and advancing American influence. I know that these patriots will continue to serve our President and our nation with distinction.”

Trump has repeatedly clashed with McMaster, a respected three-star general, and talk that McMaster would soon leave the administration had picked up in recent weeks.

His departure follows Trump's dramatic ouster of Secretary of State Rex Tillerson last week.

It also comes after someone at the White House leaked that Trump was urged in briefing documents not to congratulate Russian President Vladimir Putin about his recent re-election win. Trump did it anyway.

McMaster was brought in after Trump's first national security adviser, Michael Flynn, was dismissed.